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Other Comprehensive Loss and Accumulated Other Comprehensive Loss (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Other Comprehensive Loss and Accumulated Other Comprehensive Loss          
Foreign currency translation adjustment $ (739,000) $ (10,821,000) $ (8,818,000) $ (9,680,000)  
Amount of Gain (Loss) Recognized in Other Comprehensive Income 100,000   100,000    
Accumulated other comprehensive loss $ (15,255,000)   $ (15,255,000)   $ (6,524,000)